Abstract
THE study of the Toms phenomenon, the large reduction in turbulent fluid friction resulting from the presence of trace amounts of certain polymers in the liquid, has advanced to a stage at which work on the effects of molecular structure is being reported1. Several authors1,2 have concluded that, for maximum drag reduction, a very flexible coil is required. Indeed, for coiling polymers, we have confirmed these results for a series of poly (n-alkyl methacrylates) (unpublished work of J. H. H.). A more basic question, however, is whether the coil itself is an optimum conformation for the additive.
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References
Liaw, G. C., PhD thesis, University of Missouri at Rolla (1968).
Merrill, E. W., Smith, K. A., Shin, H., and Mickley, H. S., Trans. Soc. Rheol., 10, 335 (1966).
Hand, J. H., and Williams, M. C., J. Appl. Polymer Sci., 13, 2499 (1969).
Mathieson, A. R., and Matty, S., J. Polymer Sci., 23, 747 (1957).
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HAND, J., WILLIAMS, M. DNA and Structural Effects in Turbulent Drag Reduction. Nature 227, 369–370 (1970). https://doi.org/10.1038/227369a0
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DOI: https://doi.org/10.1038/227369a0
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